while 1:
 from tkinter import *
 X=int(input("Введите значение X:"))
 Y=int(input("Введите значение Y:"))
 N=int(input("Введите значение N:"))
 coords = [0,0,10,0,10,10,20,10,20,30,10,30,10,20,0,20]
 if N == 0 and X>=0 and X<=500 and Y>=0 and Y<=500:
     pass
 else:
     if N > 0 and 0*N+X>=0 and 0*N+Y>=0 and 20*N+X<=500 and 20*N+Y<=500:
         pass
     else:
         if N < 0 and 20*N+X>=0 and 20*N+Y>=0 and 0*N+X<=500 and 0*N+Y<=500:
             pass
         else:
             print('Размер фигуры превышает максимальный размер поля')
             exit()


 root = Tk()
 root.title("ИТ марафон")
 root.geometry("500x500")

 canvas = Canvas(bg="white", width=500, height=500)
 canvas.pack(anchor=CENTER, expand=1)

 canvas.create_polygon(coords[0] *N+X, coords[1] *N+Y,
                       coords[2] *N+X, coords[3] *N+Y,
                       coords[4] *N+X, coords[5] *N+Y,
                       coords[6] *N+X, coords[7] *N+Y,
                       coords[8] *N+X, coords[9] *N+Y,
                       coords[10] *N+X, coords[11]*N+Y,
                       coords[12] *N+X, coords[13] *N+Y,
                       coords[14] *N+X, coords[15] *N+Y,)
 root.mainloop()
